Motorcycle Tire, Motorcycle Innertube Size Conversion

Motorcycle Street Tire Size Conversion Charts

Front Tires:

Metric	Alpha	Inch (Sidewall width marking, not wheel width)
80/90	MH90	2.50/2.75
90/90	MJ90	2.75/3.00
100/90	MM90	3.25/3.50
110/90	MN90	3.75/4.00
120/80	----	4.25/4.50
120/90	MR90	4.25/4.50
130/90	MT90	5.00/5.10

Rear Tires:

Metric	Alpha	Inch (Sidewall width marking, not wheel width)
110/90	MP85	4.50/4.75
120/90	MR90	4.50/4.75
130/80	----	5.00/5.10
130/90	MT90	5.00/5.10
140/80	----	5.50/6.00
140/90	MU90	5.50/6.00
150/80	MV85	6.00/6.25
150/90	MV85	6.00/6.25
160/80	----	6.80/7.00
180/55	----	7.00/7.25
200/60	----	7.90/8.00
230/50	----	9.50